Gregorian/ROC/Lunar Birthday Calculator
Year conversion, Chinese Zodiac, Western Zodiac, Age calculation all in one
Birthday Information
Chinese Zodiac & Western Zodiac
Results
Historical Events
Famous Birthdays
Holidays
Check Another Birthday
Calculate one for family or friends, using the last year format
Saved Birthdays
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About ROC/Gregorian/Lunar Birthday Calculator
This is the only comprehensive birthday calculator integrating ROC year and lunar calendar conversion in Taiwan. Besides basic Gregorian-ROC year conversion, it supports lunar calendar query, Chinese zodiac detection, Western zodiac analysis, actual/virtual age calculation, birthday countdown, historical events lookup, famous birthdays query, and 220+ international holidays query. Covers holidays from Taiwan, China, USA, and worldwide, including lunar calendar festivals like Spring Festival, Dragon Boat Festival, and Mid-Autumn Festival.
How to Use
- Select year format (Gregorian or ROC)
- Enter or select your birthday date
- Click the Calculate button to view complete results
Features
- ROC and Gregorian Year Conversion
- Chinese Zodiac Auto-Detection
- Complete Western Zodiac Information
- Precise Actual/Virtual Age Calculation
- 550+ Historical Events Lookup
- 2100+ Famous Birthdays Query
- 220+ Holidays Query (incl. Lunar Festivals)
Understanding the ROC Calendar
The ROC Calendar (Republic of China Calendar, also known as the Minguo calendar) is the official calendar system used in Taiwan, with 1912 as ROC Year 1. The conversion formula is: ROC Year = Gregorian Year - 1911. For example, 2024 = ROC Year 113. In Taiwan, government documents, ID cards, and academic certificates all require ROC years, making this conversion tool essential for daily life in Taiwan.
Chinese Zodiac & Western Zodiac
The Chinese Zodiac (Rat, Ox, Tiger, Rabbit, Dragon, Snake, Horse, Goat, Monkey, Rooster, Dog, Pig) is an important element in Chinese culture, cycling every 12 years to determine personality traits and fortunes. Western zodiac is determined by birth month and day, with 12 signs (Aries to Pisces). This calculator provides both systems for complete zodiac information.
Age Calculation: Actual Age vs Virtual Age
Actual age (周歲) counts from the birthday itself, adding one year each birthday - the international standard. Virtual age (虛歲) is the traditional Chinese method, counting 1 year at birth and adding one year every Lunar New Year. This calculator displays both ages for use in different contexts.
Historical Events, Famous Birthdays & Holidays
This tool includes over 550 important historical events, 2100 famous people (Taiwan 520, China 530, USA 550, World 540), and 220+ international holidays (covering Taiwan, China, USA, and worldwide), letting you explore what major events happened on your birthday or in your birth year, which celebrities share your birthday, and what holidays are celebrated. Holidays include public holidays, traditional festivals (such as lunar calendar festivals like Spring Festival, Dragon Boat Festival, Mid-Autumn Festival), religious holidays, and cultural celebrations. Each event, person, and holiday is rated by importance with detailed information, prioritizing the most significant content.
Common Use Cases
- Filling out Taiwan government forms, health insurance cards, ID cards requiring ROC years
- Checking Chinese zodiac compatibility, yearly fortune, and numerology
- Calculating actual and virtual ages for traditional ceremonies
- Exploring major historical events on your birthday
- Discovering famous people born on the same day
- Planning birthday celebrations with interesting conversation topics
Frequently Asked Questions
How is the ROC year calculated?
ROC Year = Gregorian Year - 1911. For example: 2024 = ROC Year 113. ROC Year 1 corresponds to 1912, the founding year of the Republic of China.
What is the difference between actual age and virtual age?
Actual age (周歲) counts from the birthday, increasing by one each birthday. Virtual age (虛歲) is the traditional method, counting 1 at birth and adding one every Lunar New Year. For example, a baby born in January 2024 is 0 in actual age, but after the Lunar New Year becomes 2 in virtual age.
How is the Chinese zodiac determined?
The Chinese zodiac follows the lunar calendar, with each year corresponding to one animal (Rat, Ox, Tiger, Rabbit, Dragon, Snake, Horse, Goat, Monkey, Rooster, Dog, Pig) in a 12-year cycle. Note that the zodiac changes at the Lunar New Year (Spring Festival), not January 1st. This calculator uses a simplified algorithm with ~98% accuracy.
How many historical events, famous people, and holidays are included?
This calculator includes over 550 important historical events, 2100 famous people's birthdays (Taiwan 520, China 530, USA 550, World 540), and 220+ international holidays (covering Taiwan, China, USA, and worldwide). Holidays include lunar calendar traditional festivals (Spring Festival, Dragon Boat Festival, Mid-Autumn Festival, etc.), public holidays, religious holidays, and cultural celebrations, covering politics, science, arts, sports, and culture. Each entry is rated by importance, with the system prioritizing the most significant events, figures, and holidays.
